I have always hoped for a D & D license...Any brick-built monster based theme would probably satisfy me...most fantasy monsters do not have to be licensed, so Lego does not have to get a license to make a D & D like theme...

I would like to have some ancient themes like romans, greeks... There could be included warriors, philosophers, priests (gods) and peasantsAs buildings there would be possible: arena/colloseum, temple, harbour, big warship, olympus, trojan horse, aqueduct, land villa...Maybe including some (brickbuilt) monsters as enemys for some heros or gods ?There could be many subthemes like expansion e.g. colonies in africa, near east, britain, barbarian tribes and the god world.In this theme there could be included everything I 'd like to see, especially peasants, women and black figs.

Nice to see that Lego wants to hear what its fans would like !

You can see my MoCs on my Flickr Account and you can see them also on my Blog where you also can read the stories behind the MoCs...but in german.

One idea which keeps coming back to me would be a licensed theme for Lego to do a Smurf village. The new micro-sized gaming minifigures would be the perfect size for Smurfs, and it would be really neat to have some Phrygian caps for them to wear.

Ancient Greece/Rome - Already mentioned above, but I just wanted to amplify it a bit. This is one of the most-requested non-licensed theme ideas among AFOLs. Recently the excitement over the Spartan collectible fig, hopes that the initial rumors of the Atlantis theme would be ancient Greece, and the excitement over the new grooved 2x2 round bricks (i.e. Greek columns) all demonstrate strong community interest in such a theme. This could go in a more historically realistic direction with armies, temples, chariots, colosseums etc, or a more mythic direction Pegasus, Cerebrus, centaurs, Medusa etc. There are tons of great MOCs out there showing just how great a LEGO line could be.

Fairy tales - Not Disney (though I suppose such a thing is possible with the recent broad Disney license), but all of those stories - Cinderella, Snow White, Hansel and Gretel etc go way back and have no need for licensing. These stories continue to be perennial favorites, particularly with girls. This is a theme that could be very girl-friendly, but wouldn't have to be all about pink and lavender bricks and could easily appeal to Castle builders.

Both of these themes are ones that Playmobile has explored, presumably successfully. Not that LEGO needs to copy Playmo, but they have similar customer bases and show the possible commercial viability of the lines.

Comic book heroes - I am generally NOT a proponent of licensed themes, but either a general Marvel or DC license would be very popular. Not just limited to specific movies (as in the Spider-Man license) or even a specific character (since the Batman line seemed to draw from movies/comics/cartoons/TV), but the ability to go across the whole universe of characters. As with Star Wars, this license could tap into a well established fan community that spans decades, so you get both kids and their parents excited.

Circus or zoo - These have been successful lines with Duplo, I'd love to see them in System. As with Farm (and please, continue this line as well), these are a great way to introduce new fig-scale animals that would be popular both with the AFOL community, and also with younger kids who are too old for Duplo.

Wild West - This was such an outstanding theme and died too soon. I always argued that there should have been a third year with emphasis on civilian sets (covered wagon, homesteaders' farm, general store, train station (crossover potential into train theme). The new cow element provides the much needed missing piece from the older Western sets. Also, this is a line that could be boy-centric with gunfights etc, but could also be appealing to girls - think of the long popularity of Little House on the Prairie books among young girls, or the American Girls books.

Ahhh, I have a theme in mind that both adults and kids would enjoy, me thinks!

A Merchant theme!

Think about it! We have all these pirate ships, and Imperial ships and whatnot, but only one, tiny, itty bitty little merchant set that came in a most expensive base! So what the heck are those pirate supposed to pillage and plunder from?

A list of sets could be something like this

The large set, ($120-$150)* would have a port, with a small merchant vessel. The port could have two or three building facades (for easier play) a wharf, with a small rowboat with a pirate or two on it. Figs would be about 8, having three merchants, one soldier, one pirate, two townsfolk, and one governor dude. The three buildings could be a blacksmith shop, an inn, and a house. A church or a fort could be on the list as well.

The medium large set ($80ish) would be a merchant vessel, utilizing some new small hulls, with one mast (Think old Imperial flagship design) Would have 4 figs. Three merchants, and one pirate, who might or might not have a boat of his own. A raft might work.

A medium set ($50ish) would be a smaller version of the large set, but with only one building facade, and an even smaller boat. Figs would be about 3, with 2 merchants, and a villager. The building could be a repeat of one in the larger set, but a different one, like a stable (With a horse), or perhaps the port master’s office. Perhaps it could even attach to the large one, which could be modular (And perhaps in the style of the recent Soldiers fort?)

The small-medium set ($30ish) could be a small pirate boat, to attack that merchant ship. Would be around the size of the original Merchant ship form the Imperial Trading Post. Would have two or three pirates, and maybe a prisoner.

The small set ($10-$15) could be something along the lines of the Cario Ambush set from the Indiana Jones line. A small stall, with a large barrel, with four figs. Figs would be one soldier, one pirate, and two townsfolk.

Heck, there could even easily be two impulse sets. One would have a merchant, with some merchandise (Some food, a bottle or two, a crate to carry it all) and the other could be a pirate on a raft (Like the good ol’ days), equipped with a cutlass and flag, and perhaps some stolen booty!

Really, if a line like this was out, I wouldn’t hesitate to buy it all! And I think it could go along well with the PotC line.

I have to say I have long wished for a Classical Greco-Roman theme and would support that suggestion as well as the call for a zoo and/or safari theme. I am surprised I have not seen a shout out for Steampunk - all kinds of Jules Verne-inspired fun for everyone!

I would like to propose a new sub-theme of/replacement for the Wild West theme: Alta California . The settling of the west and the California Gold Rush provide a wealth of settings and sub-theme possibilities from settler wagon trains to Mexican Haciendas. Almost a bridge between the Pirates and Wild West sets this could be economical as a lot of new uses could be found for prexisting elements in this theme - including the new sombrero!

I would also like to see the Prohibition/Mobster theme that was once under development revived. Bootleggers and the police and federal agents in pursuit provide a lot of opportunities for boats, cars, trucks and even trains and aircraft in addition to 1920's era buildings on which to base sets. Tommy guns are already available from the Batman line and fedoras from Indiana Jones are already available in other lines and in several colours. This would also tap into the apparent revival of mobsters as an element of pop-culture (ie:Boardwalk Empire).

I've always wanted a middle eastern theme, like arab caravans and oasis, camels and tents, a castle with a casbah marketplace. A lot of this has been done now with the Prince of Persia, but I think they could do even more with it.

One thing that would appeal to me would be minifig scale Neolithic Britain sites. Possibly a tie in with the rumored return of Adventurers, or maybe a line for Creator as models for the adult market. More than Stonehenge (which technically isn't a henge), there are thousands of stone age sites across the Bittish Isles to draw inspiration from. These would be part heavy, but the Creator direction would likely not require any new piece designs. The Adventurers route might require a revival of Vikings and Fantasy Era pieces in new colors or with new printed designs/stickers.